Meet Tori Spelling's Baby Boy Finn!

Twenty weeks into Spelling's fourth pregnancy, doctors diagnosed her with a condition known as placenta previa -- a condition in which the placenta covers the cervix, leading to massive internal bleeding. She was even at risk for a bleed catastrophic enough to force doctors to terminate her pregnancy.

The actress and reality star, 39, spent 10 weeks in the hospital and four grueling months on bed rest, worrying about dying and leaving her family behind. But she kept her ordeal secret from fans. In the new issue of Us Weekly, on stands Friday, the mother of four shares the emotional story of her terrifying pregnancy with son Finn.

"I just remember thinking, I can't leave three children behind," Spelling, 39, tells Us exclusively of Liam, 5, Stella, 4, and Hattie, 12 months, who she shares with husband of six years Dean McDermott. The Craft Wars host's condition was caused in part by conceiving Finn just one month after giving birth to daughter Hattie, and undergoing three prior C-sections.